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Magnetic evidence of seismic fluid processes along the East Yibug Chaka Fault, Tibet
Tectonophysics ( IF 2.9 ) Pub Date : 2022-07-25 , DOI: 10.1016/j.tecto.2022.229500
Dongliang Liu , Eric C. Ferré , Haibing Li , Yu-Min Chou , Huan Wang , Chorng-Shern Horng , Zhiming Sun , Jiawei Pan , Marie-Luce Chevalier , Yong Zheng , Chenglong Ge , Fucai Liu

Magnetic mineral assemblages record physical and chemical changes that occur during and after seismic events with large slips. For example, previous studies have reported that siderite, a common phase in carbonate rocks and a cement in noncarbonate rocks, breaks down to neoformed magnetite due to seismic friction or fluid related to earthquakes and high-velocity activities. Seismic magnetic mineral transformation of siderite to hematite, while also possible, is less common. Here, we present new rock magnetism and X-ray diffraction data to assess the magnetic mineral assemblage and mineral reactions along the East Yibug Chaka Fault, Tibetan Plateau. These data from well-exposed outcrops document the presence of siderite, magnetite and hematite. We show that abundant magnetite is neoformed during historic seismic fluid processes due to the breakdown of siderite at ~300–400 °C and that hematite forms from magnetite and siderite through subsequent interaction with interseismic fluids and/or Earth surface weathering.

更新日期:2022-07-28
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